. >> a boston university graduate student from china and 29-year-old krystle campbell a restaurant manager supporting a friend were also killed in the blast the 76 people remain in the hospital. 20 of them are critical. president obama will visit best temperature to take part in a prayer vigil for the victims. >> there is encouraging news for the family of a martinez boy injured in the explosions. friends and neighbors are coming together to help raise money for the family to deal with their expenses. abc7 news reporter cornell bernard has more. >> it is amazing the love and support that martinez is showing for the 11-year-old aaron hern and the family. custody no different, mountain mike's pizza will raise money to help the family with their expenses. 11-year-old aaron hern was waiting to his mom at finish line at the boston marathon and one of the bombs went off. shrapnel from the blast tore into his thigh, he remains hospitalized at children's hospital. friends and complete strangers have been organizing fundraisers for the family. last night, rocks on main raised $4,000 offering a past